Just got a new 01' 400e and am interested in an after market pipe. I read the Dirt Bike pipe shootout and the White Bros. R series won, however, I have also heard good things about the FMF powerQ4. Is there really a significant power gain over stock? Should I go with a slip on or the full header? Any opinions on those two? Also , is it absolutely necessary to check the valves after 5 hours? Is is something easily done? how? I am 6'3 and weigh 205lbs and the suspension bottoms out even on minor whoops. Can I simply adjust the clicks on the stock suspension or will I need to go aftermarket? How many clicks should I go to on both rebound and compression (front and rear)? I love the bike so far but this half throttle break in thing is a drag. Only 5 more hours of that then I can really see what this bike can do!